If Nikon thought its 36-megapixel D800 would be the king of the resolutions this week, they were wrong. Sigma, it seems, didn't get the memo and has crashed the party, updating its DP1 and DP2 compacts with whopping 46-megapixel sensors. Okay, so technically it's three 15.3 megapixel layers (that also being the effective resolution), but we'll play along with the marketing spin. Rebranded as the DP1- and DP2-Merrill in honor of the sensor's co-creator, the r
